How quiet is the removable hardtop compared to say a Z3 Coupe or a 330i?

I love convertibles, but not if I am travelling a long distance at 80+ mph.

I have had the hardtop for 3 seasons now and I love it. It is not as quiet as my 330i but it helps a lot. I don't hear to much noise outside and the radio tends to be much better. Plus I really love the look. Kind of changes the whole car!Good luck!